A decision tree is simple yet powerful model for supervised learning problems. Like the name suggests, we can think of it as a tree in which information flows along different branches--starting at the trunk and going all the way to the individual leaves. If you are wondering if you have ever seen a decision tree before, let me remind you about the spam filter figure we encountered in Chapter 1, A Taste of Machine Learning:
Example of a simple spam filter--revisited
This is basically a decision tree!
A decision tree is made of a hierarchy of questions or tests about the data (also known as decision nodes) and their ...
